[apple/network_cmds.git] / tftpd.tproj / tftpsubs.c

/*	$NetBSD: tftpsubs.c,v 1.8 2003/08/07 11:16:14 agc Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)tftpsubs.c	8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: tftpsubs.c,v 1.8 2003/08/07 11:16:14 agc Exp $");
#endif
#endif /* not lint */

/* Simple minded read-ahead/write-behind subroutines for tftp user and
   server.  Written originally with multiple buffers in mind, but current
   implementation has two buffer logic wired in.

   Todo:  add some sort of final error check so when the write-buffer
   is finally flushed, the caller can detect if the disk filled up
   (or had an i/o error) and return a nak to the other side.

			Jim Guyton 10/85
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include "tftp.h"

#include <stdio.h>
#include <unistd.h>

#include "tftpsubs.h"

struct bf {
	int counter;            /* size of data in buffer, or flag */
	char buf[MAXPKTSIZE];   /* room for data packet */
} bfs[2];

				/* Values for bf.counter  */
#define BF_ALLOC -3             /* alloc'd but not yet filled */
#define BF_FREE  -2             /* free */
/* [-1 .. SEGSIZE] = size of data in the data buffer */

static int nextone;		/* index of next buffer to use */
static int current;		/* index of buffer in use */

				/* control flags for crlf conversions */
int newline = 0;		/* fillbuf: in middle of newline expansion */
int prevchar = -1;		/* putbuf: previous char (cr check) */

static struct tftphdr *rw_init __P((int));

struct tftphdr *
w_init()		/* write-behind */
{
	return rw_init(0);
}

struct tftphdr *
r_init()		/* read-ahead */
{
	return rw_init(1);
}

static struct tftphdr *
rw_init(x)			/* init for either read-ahead or write-behind */
	int x;			/* zero for write-behind, one for read-head */
{
	newline = 0;		/* init crlf flag */
	prevchar = -1;
	bfs[0].counter =  BF_ALLOC;     /* pass out the first buffer */
	current = 0;
	bfs[1].counter = BF_FREE;
	nextone = x;                    /* ahead or behind? */
	return (struct tftphdr *)bfs[0].buf;
}

/* Have emptied current buffer by sending to net and getting ack.
   Free it and return next buffer filled with data.
 */
int
readit(file, dpp, amt, convert)
	FILE *file;                     /* file opened for read */
	struct tftphdr **dpp;
	int amt;
	int convert;                    /* if true, convert to ascii */
{
	struct bf *b;

	bfs[current].counter = BF_FREE; /* free old one */
	current = !current;             /* "incr" current */

	b = &bfs[current];              /* look at new buffer */
	if (b->counter == BF_FREE)      /* if it's empty */
		read_ahead(file, amt, convert);      /* fill it */
/*      assert(b->counter != BF_FREE);*//* check */
	*dpp = (struct tftphdr *)b->buf;        /* set caller's ptr */
	return b->counter;
}

/*
 * fill the input buffer, doing ascii conversions if requested
 * conversions are  lf -> cr,lf  and cr -> cr, nul
 */
void
read_ahead(file, amt, convert)
	FILE *file;                     /* file opened for read */
	int amt;			/* number of bytes to read */
	int convert;                    /* if true, convert to ascii */
{
	int i;
	char *p;
	int c;
	struct bf *b;
	struct tftphdr *dp;

	b = &bfs[nextone];              /* look at "next" buffer */
	if (b->counter != BF_FREE)      /* nop if not free */
		return;
	nextone = !nextone;             /* "incr" next buffer ptr */

	dp = (struct tftphdr *)b->buf;

	if (convert == 0) {
		b->counter = read(fileno(file), dp->th_data, amt);
		return;
	}

	p = dp->th_data;
	for (i = 0 ; i < amt; i++) {
		if (newline) {
			if (prevchar == '\n')
				c = '\n';       /* lf to cr,lf */
			else    c = '\0';       /* cr to cr,nul */
			newline = 0;
		}
		else {
			c = getc(file);
			if (c == EOF) break;
			if (c == '\n' || c == '\r') {
				prevchar = c;
				c = '\r';
				newline = 1;
			}
		}
	       *p++ = c;
	}
	b->counter = (int)(p - dp->th_data);
}

/* Update count associated with the buffer, get new buffer
   from the queue.  Calls write_behind only if next buffer not
   available.
 */
int
writeit(file, dpp, ct, convert)
	FILE *file;
	struct tftphdr **dpp;
	int ct, convert;
{
	bfs[current].counter = ct;      /* set size of data to write */
	current = !current;             /* switch to other buffer */
	if (bfs[current].counter != BF_FREE)     /* if not free */
		(void)write_behind(file, convert); /* flush it */
	bfs[current].counter = BF_ALLOC;        /* mark as alloc'd */
	*dpp =  (struct tftphdr *)bfs[current].buf;
	return ct;                      /* this is a lie of course */
}

/*
 * Output a buffer to a file, converting from netascii if requested.
 * CR,NUL -> CR  and CR,LF => LF.
 * Note spec is undefined if we get CR as last byte of file or a
 * CR followed by anything else.  In this case we leave it alone.
 */
int
write_behind(file, convert)
	FILE *file;
	int convert;
{
	char *buf;
	int count;
	int ct;
	char *p;
	int c;				/* current character */
	struct bf *b;
	struct tftphdr *dp;

	b = &bfs[nextone];
	if (b->counter < -1)            /* anything to flush? */
		return 0;               /* just nop if nothing to do */

	count = b->counter;             /* remember byte count */
	b->counter = BF_FREE;           /* reset flag */
	dp = (struct tftphdr *)b->buf;
	nextone = !nextone;             /* incr for next time */
	buf = dp->th_data;

	if (count <= 0) return -1;      /* nak logic? */

	if (convert == 0)
		return write(fileno(file), buf, count);

	p = buf;
	ct = count;
	while (ct--) {                  /* loop over the buffer */
	    c = *p++;                   /* pick up a character */
	    if (prevchar == '\r') {     /* if prev char was cr */
		if (c == '\n')          /* if have cr,lf then just */
		   fseek(file, -1, 1);  /* smash lf on top of the cr */
		else
		   if (c == '\0')       /* if have cr,nul then */
			goto skipit;    /* just skip over the putc */
		/* else just fall through and allow it */
	    }
	    putc(c, file);
skipit:
	    prevchar = c;
	}
	return count;
}


/* When an error has occurred, it is possible that the two sides
 * are out of synch.  Ie: that what I think is the other side's
 * response to packet N is really their response to packet N-1.
 *
 * So, to try to prevent that, we flush all the input queued up
 * for us on the network connection on our host.
 *
 * We return the number of packets we flushed (mostly for reporting
 * when trace is active).
 */

int
synchnet(f, bsize)
	int	f;		/* socket to flush */
	int	bsize;		/* size of buffer to sync */
{
	int i, j = 0;
	char rbuf[PKTSIZE];
	struct sockaddr_storage from;
	int fromlen;

	while (1) {
		(void) ioctl(f, FIONREAD, &i);
		if (i) {
			j++;
			fromlen = sizeof from;
			(void) recvfrom(f, rbuf, sizeof (rbuf), 0,
				(struct sockaddr *)&from, &fromlen);
		} else {
			return(j);
		}
	}
}
Commit	Line	Data
2b484d24 A	1	/* $NetBSD: tftpsubs.c,v 1.8 2003/08/07 11:16:14 agc Exp $ */
	2
	3	/*
	4	* Copyright (c) 1983, 1993
	5	* The Regents of the University of California. All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the name of the University nor the names of its contributors
	16	* may be used to endorse or promote products derived from this software
	17	* without specific prior written permission.
	18	*
	19	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	20	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	23	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	24	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	* SUCH DAMAGE.
	30	*/
	31
	32	#include <sys/cdefs.h>
	33	#ifndef lint
	34	#if 0
	35	static char sccsid[] = "@(#)tftpsubs.c 8.1 (Berkeley) 6/6/93";
	36	#else
	37	__RCSID("$NetBSD: tftpsubs.c,v 1.8 2003/08/07 11:16:14 agc Exp $");
	38	#endif
	39	#endif /* not lint */
	40
	41	/* Simple minded read-ahead/write-behind subroutines for tftp user and
	42	server. Written originally with multiple buffers in mind, but current
	43	implementation has two buffer logic wired in.
	44
	45	Todo: add some sort of final error check so when the write-buffer
	46	is finally flushed, the caller can detect if the disk filled up
	47	(or had an i/o error) and return a nak to the other side.
	48
	49	Jim Guyton 10/85
	50	*/
	51
	52	#include <sys/types.h>
	53	#include <sys/socket.h>
	54	#include <sys/ioctl.h>
	55	#include <netinet/in.h>
	56	#include "tftp.h"
	57
	58	#include <stdio.h>
	59	#include <unistd.h>
	60
	61	#include "tftpsubs.h"
	62
	63	struct bf {
	64	int counter; /* size of data in buffer, or flag */
65	char buf[MAXPKTSIZE]; /* room for data packet */
66	} bfs[2];
67
68	/* Values for bf.counter */
69	#define BF_ALLOC -3 /* alloc'd but not yet filled */
70	#define BF_FREE -2 /* free */
71	/* [-1 .. SEGSIZE] = size of data in the data buffer */
72
73	static int nextone; /* index of next buffer to use */
74	static int current; /* index of buffer in use */
75
76	/* control flags for crlf conversions */
77	int newline = 0; /* fillbuf: in middle of newline expansion */
78	int prevchar = -1; /* putbuf: previous char (cr check) */
79
80	static struct tftphdr *rw_init __P((int));
81
82	struct tftphdr *
83	w_init() /* write-behind */
84	{
85	return rw_init(0);
86	}
87
88	struct tftphdr *
89	r_init() /* read-ahead */
90	{
91	return rw_init(1);
92	}
93
94	static struct tftphdr *
95	rw_init(x) /* init for either read-ahead or write-behind */
96	int x; /* zero for write-behind, one for read-head */
97	{
98	newline = 0; /* init crlf flag */
99	prevchar = -1;
100	bfs[0].counter = BF_ALLOC; /* pass out the first buffer */
101	current = 0;
102	bfs[1].counter = BF_FREE;
103	nextone = x; /* ahead or behind? */
104	return (struct tftphdr *)bfs[0].buf;
105	}
106
107	/* Have emptied current buffer by sending to net and getting ack.
108	Free it and return next buffer filled with data.
109	*/
110	int
111	readit(file, dpp, amt, convert)
112	FILE file; / file opened for read */
113	struct tftphdr **dpp;
114	int amt;
115	int convert; /* if true, convert to ascii */
116	{
117	struct bf *b;
118
119	bfs[current].counter = BF_FREE; /* free old one */
120	current = !current; /* "incr" current */
121
122	b = &bfs[current]; /* look at new buffer */
123	if (b->counter == BF_FREE) /* if it's empty */
124	read_ahead(file, amt, convert); /* fill it */
125	/* assert(b->counter != BF_FREE);// check */
126	dpp = (struct tftphdr )b->buf; /* set caller's ptr */
127	return b->counter;
128	}
129
130	/*
131	* fill the input buffer, doing ascii conversions if requested
132	* conversions are lf -> cr,lf and cr -> cr, nul
133	*/
134	void
135	read_ahead(file, amt, convert)
136	FILE file; / file opened for read */
137	int amt; /* number of bytes to read */
138	int convert; /* if true, convert to ascii */
139	{
140	int i;
141	char *p;
142	int c;
143	struct bf *b;
144	struct tftphdr *dp;
145
146	b = &bfs[nextone]; /* look at "next" buffer */
147	if (b->counter != BF_FREE) /* nop if not free */
148	return;
149	nextone = !nextone; /* "incr" next buffer ptr */
150
151	dp = (struct tftphdr *)b->buf;
152
153	if (convert == 0) {
154	b->counter = read(fileno(file), dp->th_data, amt);
155	return;
156	}
157
158	p = dp->th_data;
159	for (i = 0 ; i < amt; i++) {
160	if (newline) {
161	if (prevchar == '\n')
162	c = '\n'; /* lf to cr,lf */
163	else c = '\0'; /* cr to cr,nul */
164	newline = 0;
165	}
166	else {
167	c = getc(file);
168	if (c == EOF) break;
169	if (c == '\n' \|\| c == '\r') {
170	prevchar = c;
171	c = '\r';
172	newline = 1;
173	}
174	}
175	*p++ = c;
176	}
177	b->counter = (int)(p - dp->th_data);
178	}
179
180	/* Update count associated with the buffer, get new buffer
181	from the queue. Calls write_behind only if next buffer not
182	available.
183	*/
184	int
185	writeit(file, dpp, ct, convert)
186	FILE *file;
187	struct tftphdr **dpp;
188	int ct, convert;
189	{
190	bfs[current].counter = ct; /* set size of data to write */
191	current = !current; /* switch to other buffer */
192	if (bfs[current].counter != BF_FREE) /* if not free */
193	(void)write_behind(file, convert); /* flush it */
194	bfs[current].counter = BF_ALLOC; /* mark as alloc'd */
195	dpp = (struct tftphdr )bfs[current].buf;
196	return ct; /* this is a lie of course */
197	}
198
199	/*
200	* Output a buffer to a file, converting from netascii if requested.
201	* CR,NUL -> CR and CR,LF => LF.
202	* Note spec is undefined if we get CR as last byte of file or a
203	* CR followed by anything else. In this case we leave it alone.
204	*/
205	int
206	write_behind(file, convert)
207	FILE *file;
208	int convert;
209	{
210	char *buf;
211	int count;
212	int ct;
213	char *p;
214	int c; /* current character */
215	struct bf *b;
216	struct tftphdr *dp;
217
218	b = &bfs[nextone];
219	if (b->counter < -1) /* anything to flush? */
220	return 0; /* just nop if nothing to do */
221
222	count = b->counter; /* remember byte count */
223	b->counter = BF_FREE; /* reset flag */
224	dp = (struct tftphdr *)b->buf;
225	nextone = !nextone; /* incr for next time */
226	buf = dp->th_data;
227
228	if (count <= 0) return -1; /* nak logic? */
229
230	if (convert == 0)
231	return write(fileno(file), buf, count);
232
233	p = buf;
234	ct = count;
235	while (ct--) { /* loop over the buffer */
236	c = p++; / pick up a character */
237	if (prevchar == '\r') { /* if prev char was cr */
238	if (c == '\n') /* if have cr,lf then just */
239	fseek(file, -1, 1); /* smash lf on top of the cr */
240	else
241	if (c == '\0') /* if have cr,nul then */
242	goto skipit; /* just skip over the putc */
243	/* else just fall through and allow it */
244	}
245	putc(c, file);
246	skipit:
247	prevchar = c;
248	}
249	return count;
250	}
251
252
253	/* When an error has occurred, it is possible that the two sides
254	* are out of synch. Ie: that what I think is the other side's
255	* response to packet N is really their response to packet N-1.
256	*
257	* So, to try to prevent that, we flush all the input queued up
258	* for us on the network connection on our host.
259	*
260	* We return the number of packets we flushed (mostly for reporting
261	* when trace is active).
262	*/
263
264	int
265	synchnet(f, bsize)
266	int f; /* socket to flush */
267	int bsize; /* size of buffer to sync */
268	{
269	int i, j = 0;
270	char rbuf[PKTSIZE];
271	struct sockaddr_storage from;
272	int fromlen;
273
274	while (1) {
275	(void) ioctl(f, FIONREAD, &i);
276	if (i) {
277	j++;
278	fromlen = sizeof from;
279	(void) recvfrom(f, rbuf, sizeof (rbuf), 0,
280	(struct sockaddr *)&from, &fromlen);
281	} else {
282	return(j);
283	}
284	}
285	}